How to show transforms of Child Of or Copy Transforms constraint
I found the solution it was an answer in this question: Is there a way to convert a constraint to a keyframe?

You have to use Bake Action and then tick "Visual Keying" and probably also select the bone you want to bake the action for. This will make keyframes for any visual transforms.

Also in Pose Mode you can select bones and hit Ctrl+A and then use Apply Visual Transform.

I think you can insert keyframes for it with I -> Visual Transform too.